Mitsubishi Electric CAHV-P500YB-HPB Service Handbook page 161

[ IX Troubleshooting ]
6. 4-way valve replacement instructions
1) Remove the upper and
lower service panels.
(Panel FU and FB)
(1) Remove the service panel. (See figure at above)
(2) Remove the connector of the 4-way valve in the trouble.
(3) Remove the 4-way valve coil.
HWE15070
2) Remove the cables from the
Frame Assy MU (top) and MB (bottom),
and remove the Frame assy MU and MB.
21S4
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GB